An ohio couple getting married. A sound check going on next door. It was the beach boys that were sound checking. That gave them a gift they'll never forget. Reporter: Mark kent and jamie diamond had been anticipating this day from the moment they got engaged four months ago. BUT AUGUST 4th, THEIR WEDDING Day, didn't turn out as planned. The boat went by. And the minister said, interruptions are going to happen in your marriage. And so, it was funny. Reporter: All risks that come along with an outdoor wedding in downtown cleveland. But what followed at the concert hall next door, changed the whole tenor of the day, when they were interrupted by the legendary band, the beach boys. During the ceremony, they were performing "god only knows." They couldn't have picked a better song for the ceremony. wedding, the beach boys had unwittingly done just that. It couldn't have been more perfect. We felt awkward about having made a lot of noise during their wedding. So, we invited the whole wedding party to our concert. Reporter: When jamie heard the news, she and her aunts rushed over to take advantage of the free invite. Before they knew it, they were up on stage with a band jamie loved from childhood. We didn't think about it. You just do stuff, in the moment. Create some good vibrations. Have some fun, fun, fun. I was up dancing. Oh, I grabbed on. And I was shaking it. &#9834; She'll have fun, fun, fun &#9834; Reporter: All of the fun was unfortunately missed by her new husband, mark, who was back at the wedding, partying with his groomsmen. There's no question about what their special song will be. I think this is a good excuse to make the beach boys "god only knows" our official song of our relationship. Reporter: For "good morning america," linsey davis, abc news, new york. That's really nice. Okay. He was -- we just do stuff. We just do stuff. Creating good vibrations. Coming up here, uncle si,

This transcript has been automatically generated and may not be 100% accurate.